| Summary: | Pristine high-density bulk disks of MgB<sub>2</sub> with added hexagonal BN (10 wt.%) were prepared using spark plasma sintering. The BN-added samples are machinable by chipping them into desired geometries. Complex shapes of different sizes can also be obtained by the 3D printing of polylactic acid filaments embedded with MgB<sub>2</sub> powder particles (10 wt.%). Our present work aims to assess antimicrobial activity quantified as viable cells (CFU/mL) vs. time of sintered and 3D-printed materials. In vitro antimicrobial tests were performed against the bacterial strains <i>Escherichia coli</i> ATCC 25922, <i>Pseudomonas aeruginosa</i> ATCC 27853, <i>Staphylococcus aureus</i> ATCC 25923, <i>Enterococcus faecium</i> DSM 13590, and <i>Enterococcus faecalis</i> ATCC 29212; and the yeast strain <i>Candida parapsilosis</i> ATCC 22019. The antimicrobial effects were found to depend on the tested samples and microbes, with <i>E. faecium</i> being the most resistant and <i>E. coli</i> the most susceptible.
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